A simple puzzle game. Initially it fit into just 8 KiB, then grew to 16 KiB and then 23 KiB, now it's a 25 KiB file for DOS, the 3DS version is 242 KiB and the PSP version is 640 KiB (due to homebrew packing in lots of standard library files; the size could be optimized, but I decided not to).
How to play: There are 2x2-blocks falling down the top, with two different colors. Use LEFT/RIGHT/DOWN to move the block and use UP to rotate it. Use SPACE to drop the block (it will fall fast until it lands).
Controls: Arrows, SPACE, ESC to quit.
There's in-game help now on how to play the game. You can configure the language, soundtrack and difficulty level in the options menu. For DOS, the options menu also allows to choose between PC Speaker, OPL-2, MIDI and CDDA.